You flood the target with negative energy, sinking it deep into his very bones and awakening it to cruel unlife, before the actual creature has even perished. The subject must make a Fortitude save, or die horribly as its own skeleton crawls out of its body, becoming an animated skeleton of appropriate size, shape, and HD as if you had animated the creature as a skeleton (this spell ignores the HD limit of animate dead, a creature of any HD may be turned into a skeleton in this way). It follows your commands and lasts for the duration of the spell, before falling apart into a useless pile of rubble. You can’t create more HD of undead than twice your caster level with a single casting of Evil Within. (The desecrate spell doubles this limit).